1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones
Datasheet
During Power on Reset (POR), the default values are stored in the registers. A POR is initiated when
power is first applied to the part and the voltage on the VDD supply surpasses the POR level as
specified in the electrical characteristics. Any reads to undefined registers will return 00h. Writes to
undefined registers will not have an effect.
The EMC1053 uses an interlock mechanism that will update the Low byte of a particular monitor when
the High Byte is read. This prevents changes in register content when the ADC updates between
successive reads.
4.1
Legacy Temperature Data Registers (00h, 23h, 01h, 10h, F8h,
F9h)
As shown in Table 4.1, each temperature monitor has two data registers. The 11 bit temperature data
is stored aligned to the left resulting in the High Byte containing temperature in 1°C steps and the Low
Byte containing fractions of a degree.
4.2
4.3
Extended Format Temperature Registers (FAh-FDh)
The Extended Format Temperature Registers store only the external diode temperatures in the
extended data format. This is because, due to the operating range limitations of the EMC1053, the
internal temperature could not benefit from the extended temperature range. Like the Legacy data
formatting, the data is stored in two registers per temperature channel.
Status Register - 02h
Table 4.2 Status Register
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
D2
B0
D1
DEFAULT
02h
Status
Busy
-
-
HOTTER
-
-
00h
The Status Register is a read only register and returns the operational status of the part. External diode
faults are indicated by bits 1 and 0. If either bit is set to ‘1’, then a diode fault has occurred. When a
diode fault occurs, the D1 or D2 status bit is set, but otherwise the data remains unchanged.
Bit 7 - Busy - indicates that the ADC is currently converting a temperature.
Bit 4 - HOTTER - during Hotter of Two mode, this bit indicates which of the external diode channels
is hotter. If this bit is ‘0’, then External Diode 1 is hotter or equal to External Diode 2. If this bit is ‘1’,
then External Diode 2 is hotter than External Diode 1. During normal operation, this bit will always read
a ‘0’.
Bit 1 - D2 - indicates that a diode fault has occurred on External Diode 2.
Bit 0 - D1 - indicates that a diode fault has occurred on External Diode 1.
4.4
Configuration Register (03h Read, 09h Write)
Table 4.3 Configuration Register
ADDR
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
03h Read, Config
09h Write
-
STANDBY
-
-
-
CR<2:0>
45h
Revision 1.37 (02-05-07)
SMSC EMC1053
DATA1S8HEET
SMSC [ SMSC CORPORATION ]
